ROPP研究文章|色散增益增强非对称谐振无线电能传输

A series of illustrations taken from the open access article showing Figure 1. Comparison between conventional-gain-based and dispersive-gain-based wireless power transfer schemes as the coupling coefficient k varies. (a) Conventional saturation-gain and dispersion-gain schemes. (b), (c) Comparison of (b) devices’ gain and (c) steady-state required gain spectrum. Circuit diagrams of the coupled resonator system using (d) parallel–parallel (PP) and (e) parallel–series (PS) topologies. (f), Calculated energy storage ratio |a2/a1| 2 , (g) power transfer efficiency and (h) required steady-state losses γnl as functions of the coupling parameter k of the parallel–parallel circuit (d). (i)–(k) correspond to (f)–(h) but for the parallel–series topology shown in (e). For all figures, the asymmetry parameter is χ = 4/3. Shaded regions in (f)–(h) and (i)–(k) denote the strongly coupling region, which are determined by the intersection points of the desired steady-state loss (6) spectrum in (h) and (k), respectively. In (h) and (k), kPP and kPS are the critical coupling parameters at the intersection points where the steady-state loss transition occurs in PP and PS circuits, respectively.

Parity-time (PT) symmetry is a fundamental concept in non-Hermitian physics that has recently gained attention for its potential in engineering advanced electronic systems and achieving robust wireless power transfer (WPT) even in the presence of disturbances, through the incorporation of nonlinearity. However, the current PT-symmetric scheme falls short of achieving the theoretical maximum efficiency of WPT and faces challenges when applied to non-resistive loads. In this study, we propose a theoretical framework and provide experimental evidence demonstrating that asymmetric resonance, based on dispersive gain, can greatly enhance the efficiency of WPT beyond the limits of symmetric approaches. By leveraging the gain spectrum interleaving resulting from dispersion, we observe a mode switching phenomenon in asymmetric systems similar to the symmetry-breaking effect. This phenomenon reshapes the distribution of resonance energy and enables more efficient WPT compared to conventional methods. Our findings open up new possibilities for harnessing dispersion effects in various domains such as electronics, microwaves, and optics. This work represents a significant step towards exploiting dispersion as a means to optimize WPT and lays the foundation for future advancements in these fields.